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Equilibrium sampling through membranes of freely dissolved copper concentrations with selective hollow fiber membranes and the spectrophotometric detection of a metal stripping agent

Romero, Roberto LU ; Liu, Jing-fu LU ; Mayer, P and Jönsson, Jan Åke LU (2005) In Analytical Chemistry 77(23). p.7605-7611
Abstract
A sensitive spectrophotometric method for the determination of freely dissolved copper concentrations in aqueous samples after preconcentration with hollow fiber membrane extraction has been developed. The method is based on the equilibrium sampling through a selective membrane into an acceptor solution containing 4-(pyridyl-2-azo)resorcinol (PAR), which serves as stripping agent and metal indicator. Negligible extraction of interferences and equilibrium enrichment of copper allowed for selective spectrophotometric determination of the Cu-PAR complex. Some important extraction parameters such as acceptor composition, shaking, equilibrium time, and sample volume were studied. The optimized methodology showed good linearity in the range of... (More)
A sensitive spectrophotometric method for the determination of freely dissolved copper concentrations in aqueous samples after preconcentration with hollow fiber membrane extraction has been developed. The method is based on the equilibrium sampling through a selective membrane into an acceptor solution containing 4-(pyridyl-2-azo)resorcinol (PAR), which serves as stripping agent and metal indicator. Negligible extraction of interferences and equilibrium enrichment of copper allowed for selective spectrophotometric determination of the Cu-PAR complex. Some important extraction parameters such as acceptor composition, shaking, equilibrium time, and sample volume were studied. The optimized methodology showed good linearity in the range of 5-100 mu g/L, an enrichment factor of 93, good repeatability and reproducibility (RSDs < 6%, n = 6), and a detection limit of 4 mu g/L. The cationic metals Ni2+, CO2+, Cd2+, Fe3+, Pb2+, Zn2+, and Mn2+ were shown not to interfere with the measurement of Cu2+. Measurements on samples containing mixtures of various ligands and cations were in good agreement with theoretically calculated concentrations, and the method was also applied to environmental samples. The developed technique requires less labor and less sophisticated equipment than conventional methods typically based on atomic absorption spectrometry or ICP. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Analytical Chemistry
volume
77
issue
23
pages
7605 - 7611
publisher
The American Chemical Society
external identifiers
  • wos:000233785900024
  • scopus:28544439626
ISSN
1520-6882
DOI
10.1021/ac050763a
language
English
LU publication?
yes
id
ed640cf0-aaf2-42c0-b41b-1210e4cf13a1 (old id 150846)
date added to LUP
2007-06-27 14:22:06
date last changed
2017-08-20 03:28:03
@article{ed640cf0-aaf2-42c0-b41b-1210e4cf13a1,
  abstract     = {A sensitive spectrophotometric method for the determination of freely dissolved copper concentrations in aqueous samples after preconcentration with hollow fiber membrane extraction has been developed. The method is based on the equilibrium sampling through a selective membrane into an acceptor solution containing 4-(pyridyl-2-azo)resorcinol (PAR), which serves as stripping agent and metal indicator. Negligible extraction of interferences and equilibrium enrichment of copper allowed for selective spectrophotometric determination of the Cu-PAR complex. Some important extraction parameters such as acceptor composition, shaking, equilibrium time, and sample volume were studied. The optimized methodology showed good linearity in the range of 5-100 mu g/L, an enrichment factor of 93, good repeatability and reproducibility (RSDs &lt; 6%, n = 6), and a detection limit of 4 mu g/L. The cationic metals Ni2+, CO2+, Cd2+, Fe3+, Pb2+, Zn2+, and Mn2+ were shown not to interfere with the measurement of Cu2+. Measurements on samples containing mixtures of various ligands and cations were in good agreement with theoretically calculated concentrations, and the method was also applied to environmental samples. The developed technique requires less labor and less sophisticated equipment than conventional methods typically based on atomic absorption spectrometry or ICP.},
  author       = {Romero, Roberto and Liu, Jing-fu and Mayer, P and Jönsson, Jan Åke},
  issn         = {1520-6882},
  language     = {eng},
  number       = {23},
  pages        = {7605--7611},
  publisher    = {The American Chemical Society},
  series       = {Analytical Chemistry},
  title        = {Equilibrium sampling through membranes of freely dissolved copper concentrations with selective hollow fiber membranes and the spectrophotometric detection of a metal stripping agent},
  url          = {http://dx.doi.org/10.1021/ac050763a},
  volume       = {77},
  year         = {2005},
}